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2 years ago

The maximum kinetic energy of electrons ejected from a sheet of uranium exposed to 250 nm ultraviolet light is 1.33 EV.

1 answer:

7 0

Answer: The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe = hf − BE, where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.

Explanation:

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A vector always consists of _____. <br> a force <br> mass<br> size<br> direction

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Vector it always consists to size(magnitude) and direction

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4 years ago

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At what speed, as a fraction of c, does a moving clock tick at four fifth the rate of an identical clock at rest?

ololo11 [35]

Answer:

The seed as a fraction of the speed of light is $\frac{3}{5}c$

Solution:

As per the question:

Suppose, $t_{i}$ be the rate of an identical clock between two time intervals.

For a moving clock, moving with velocity 'v', at the clock tick of four-fifth:

t = $\frac{5}{4}t_{i}$

Now,

Using the relation of time dilation, from Einstein's relation:

$t = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}$

$\frac{5}{4}t_{i} = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}$

Squaring both sides:

$(\frac{5}{4})^{2} = (\frac{1}{\sqrt{1 - \frac{v^{2}}{c^{2}}}})^{2}$

$\frac{25}{16} = \frac{1}{{1 - \frac{v^{2}}{c^{2}}}}$

$1 - \frac{16}{25} = \frac{v^{2}}{c^{2}}$

$\frac{v}{c} = \sqrt{\frac{9}{25}}$

$\frac{v}{c} = \frac{3}{5}$

$v = \frac{3}{5}c$

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3 years ago

A chart showing the type of reproduction that occurs in several organisms is shown below. Organism Type of Reproduction Bacteria

quester [9]

Answer:

Explanation:

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3 years ago

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Our Sun undergoes slight orbital motion mostly due to the gravitational force exerted by Jupiter. If our solar system only conta

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Answer:

it would be longer

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3 years ago

A book of mass 3 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient o

bonufazy [111]

Answer: 24.7 degrees Max

Explanation:

m*g = 3 * 9.8 = 29.4 N. = Wt. of book. 

 Fp = 29.4*sin A = Force parallel to the plank. 

 Fn = 29.4*Cos A = Force perpendicular to the plank. 

 Fs = u*Fn = 0.46*29.4*Cos A  Fp-Fs = m*a

 29.4*sin A - 0.46*29.4*Cos A = m*0 = 0

 29.4*Sin A = 0.46*29.4*Cos A

 Sin A = 0.46*Cos A

 Divide both sides by Cos A:

 Sin A/Cos A = 0.46

 Replace Sin A/Cos A with Tan A:

 Tan A = 0.46

 A = 24.7 degrees Max.

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3 years ago